Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0ad7182b89b12093…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:40:40 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: c9bec9e45c4ada7b0ac732488ead5a71 SHA-1: ddd0457218834dedf1b21d90d6f337352198b2df SHA-256: 0ad7182b89b120934b1b0a50f39734e58224232af80fd20293e4bfde00d7199e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry point, which is a known method for executing malicious code. The macro sheet contains a reference to 'Auto_Open', suggesting it will run automatically when the workbook is opened. This technique is often used to download and execute further payloads.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6776 bytes
SHA-256: b459a6a16fd1c99fc5424b599c19455c3a94f1aba5c149aaee2faf1b4980d3c8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  zRabSZKaf
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G151 
' 0018     22 LABEL : Cell Value, String Constant - auwsZOn len=0 
' 0018     21 LABEL : Cell Value, String Constant - bJMVIn len=0 
' 0018     26 LABEL : Cell Value, String Constant - DfRyZiiicqs len=0 
' 0018     20 LABEL : Cell Value, String Constant - DnpXy len=0 
' 0018     24 LABEL : Cell Value, String Constant - dqWFBrJTW len=0 
' 0018     27 LABEL : Cell Value, String Constant - gMcAzCebChWb len=0 
' 0018     27 LABEL : Cell Value, String Constant - GsMjDgFpwNnc len=0 
' 0018     22 LABEL : Cell Value, String Constant - HLSgwJh len=0 
' 0018     25 LABEL : Cell Value, String Constant - IFuRUoyrsP len=0 
' 0018     24 LABEL : Cell Value, String Constant - nqnolaach len=0 
' 0018     22 LABEL : Cell Value, String Constant - RFsvQoU len=0 
' 0018     26 LABEL : Cell Value, String Constant - SGAKGbiRHfz len=0 
' 0018     26 LABEL : Cell Value, String Constant - SRUlTQqhISe len=0 
' 0018     22 LABEL : Cell Value, String Constant - sVtpiEr len=0 
' 0018     20 LABEL : Cell Value, String Constant - UDOxh len=0 
' 0018     24 LABEL : Cell Value, String Constant - uFeLaUzYP len=0 
' 0018     26 LABEL : Cell Value, String Constant - whmcQVriLcQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - xEohF len=0 
' 0018     20 LABEL : Cell Value, String Constant - XzaQb len=0 
' 0018     22 LABEL : Cell Value, String Constant - YduWiEk len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     
... (truncated)

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